Harness pipe-loop attachment for wax-thread sewing-machines



D. M. LEWIS. Harness PipeLoop Attachment .for Wax-Thread 'Sewing-Machines, l

No. 224,930. Patented Feb-.24,138

".FETEHS. PHOTQLITHGGRAPMER, WASHINGTON, D C4 y improved device for sewing` harness pipe-` desired angle or position, or may be drawn in.

forward.`

`and around this `part F the pipeloop P is formed, andthe under side ot' it rests or UNITED STATES PATENT OEEICE.

DAVID `M. LEWIS, OF MEMPHIS, TENNESSEE.

HARNESS PIPE-LOOP ATTACHMENT FOR WAX-THREAD SEWING-MACHINES.

l `SJSIECIFTCATION' forming part `of Letters Patent No. 224,930, dated February 24, 1880;

Application filed May 10, 1879.

To all whom `it maycoacern i Be it known that I, DAVID` M. LEWIS, of Memphis, in the county ot' Shelby and` State of Tennessee, have invented new and Improved Harness Pipe- Loop Attachments for Wax- Thread Sewing-Machines, of whichthe following is a specification. j

`Figure l is a side elevation ot' the device, partlyT in section. i Fig. 2 is aplan ofthe same.` Fig. 3 is a plan ofthe lower part of the device with the lid removed. Fig. 4 is an enlarged view of the thread-looper. i

Similarletters ofrefereuce indicate corresponding parts. v

The object of this invention is to provide an loops. I

The invention consists of a U-shaped presser-foot attachment, A,` which is fastened at its upper end, by means of the socketed boss B` and set-screw b', to the presser-foot bar C of a wax-threadsewing-machine, said presser-foot bar being vertical and reciprocating up and down as the needle feeds or the leather moves D is the upper part of the attachment, and its lower or back end is bent downward at a right angle and provided with a socket, E, to receive F, (the `lower part of the attachment,) which is held therein by a set-screw, c. Upon presses down upon the stitched side of the pipe-loop. This part is made of sheet-steel or other thin metal, with sides turned up at right angles to the bottom to make the part rigid and to forma long hollow cavity, G, on its upper side, for holding and protecting1 certain ofthe working parts of the attachment.

That end of F which is inserted in the socketE is tubular, while the other or outer end is provided with a slot, d', for the upward entrance of the needle to form the stitches.

As the relative positions of the presser-foot and needle-bars in different kinds of machines vary considerably, F is made adjustable by means of the socket E and set-screw c to any or extended at will.

In. sewing pipe-loops on bridle-checks one slot in the bottom of F.

side of the loop is always thicker than the other,` and the necessary angular pitch to the work is given by twisting or turning part F slightly'in the socket E, and the needle will not vary its position in the slot, whatever may be the angular position ot' F.

H is a thin strip of metal that forms the upper side of part F, covering its entire cav-` ity, whose overlapping side iianges hold it in place. .lt is locked with F at its forward end by a slightly indented.V and projecting lip, at which point it maybe raised by the insertion of a knife-blade or other convenient tool. This cover is provided with a slot for the needle to protrude through, placed just opposite the Upon the bottom of the cavity ot' F there is fixed a short upwardprojecting block, f and against a side of the cavity, nearly opposite, is an abutment, g, both of which serve to support the cover H against the downward pressure of the bumper I and as guides to keep the rod K in proper direction and position.

Within the cavity of F, and extending backward through its tubular end and between the jaws of theclamp hf, that is held and is compressible by the thumb-screw t" between the sides of the downward end of the slide L, is the rod K, that carries, pivoted on its forward end, a th read-.looper,M, which is a small curved nearly crescent-shaped hollow tube,'with the upper side cut open sufficiently to lay the thread throughout the whole length ot' its cavity. Upon the same pivot is the cover k of the looper, which is swung aside to permit the looper to be threaded and closed again to hold the thread within. On the pivoted end of the coveris a projecting lug, l', that keeps the thread from slipping out and obviates the trouble of securing it by running it through holes made in the looper. At the slotted or forward end, F (the lower part of the attachment) is turned upward from the bottom at an angle of about sixty degrees, to avoid too sharp corners, that might stick in the work that was being done or formed upon it. In this end of F one corner of the cavity Gr is filled by a curved block, m', whose function is to throw or direct the thread-looper to the outer side of the slot, where it holds the thread ready for the needle; then, after the needle comes up through the slot, the looper brings the a IOO thread to the inner side of the slot, where it is caught by the barb of the needle. The notch n', cut in the flange of F, is to let the thread get behind the needle.

Against the under face of the part D is secured, by pins or screws that pass through its upward-projecting lugs, thebumper or spring I, whose lower arm is high enough above the part F to leave room for the pipe-loop to pass over said part, and whose function is to resist and relieve the downward pressure upon F when the device is in operation, and thus prevent its bending or springing. This arrangement allows F to be made thin and narrow throughoutits entire length, excepting at the end that enters the socket E, so that the tightest and narrowest loops, from half-inch up to the largest size, can easily be sewed thereon. This bumper I is a little lower on the needle side of F than on the other, so that it may resist the greatest pressure in a line with the needle at whatever angle F may be set.

Covering the top and sides of the part D throughout most of its length, and extending vbackward beyond it, and held to it by the setscrew o, that passes through the slot p into the upper face of D, is the slide L, whose forked rear end is bent downward so as to extend parallel with and below thc downwardbent end of D, and holds the pulleyNand the clamp 7L. Within this clamp, as before stated, the rod K is adjustable in any position to suit the exigencies of the work to be done, and the projecting end of the rod is bent into a loop, that it may be more easily handled, and is also bent downward a little to keep it from contact with the thread O, which is used for sewing the harness pipe-loop.

Through the downward -projecting lugs of the slide L passes a pin, on which is the movable clip r. To this clip is pivoted the pushing-rod Q, to the other extremity of which is swiveled the lever R, whose extreme end is fastened in the socket-piece S, which is pushed into a socket in the lower end of the threadlooperbarof the sewing-machine, which moves horizontally on a curve of about seventy degrees, and returnsagain in constant succession. This mechanism operates the looper and its intermediate mechanism. Through the movement of the thread-looper bar, the lever R, and rod Q, the stroke of the slide L is accomplished, and may be adjusted to suit the requirements of the Work.

On some Wax-thread sewing-machines thereturn horizontal movement of the thread-looper bar is effected by a spiral spring but the action is not always sufliciently positive; therefore the spiral y'spring U, attached to slide L and boss B, is placed to assist the action of the spring on the machine.

The thread O is led to the pulley from the guide-eye on the machine. When this attachment is used the awl-bar T is disengaged. This attachment is principally to be used in large harness-factories, to facilitate the sewing of pipe-loops on harness in a rapid manner.

The sewing of pipe-loops by hand is slow and tedious Work, and greatly increases the cost ofthe harness 5 but with this attachment such work will cost less and be stronger. It can be used on lower grades of harness, and will improve their looks and increase their market value.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. The within-described attachment to awaX-thread sewing-machine, consisting of the parts D and F, in combination with boss B, cover H, bumper I, rod K, thread-looper M, slide L, pulley N, pushing-rod Q., lever R, socket-piece S, and spiral spring U, substantially as herein shown, and for the purpose described.

2. The rod K,in combination with thecurved tubular thread-louper M, provided with cover k', having lng l', substantially as herein shown and described.

3. The lower part, F, of an attachment to a wax-thread sewing-machine, provided with I block f', abutment g', slot d. block m', notch u', and slotted cover or lid H, substantially as herein shown and described.

4. The combination of the slide L, having slot p', with pulley N, clamp It', thumb-screw t", set-screw o', clip r', pushing-rod Q, lever R, socket-piece S, and spiral spring U, substantially as herein shown and described.

DAVID MAURICE LEWYIS.

Witnesses:

J oHN W. FERGUSON, OHARLns STIFEL. 

